/*
 *
 *  RYMOS
 *  Copyright (C) 2003 - 2012 Roberto Rodriguez 
 *
 *  This program is free software; you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation; either version 2 of the License, or 
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License 
 *  along with this program; if not, write to the Free Software 
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * contact me by e-mail <prfiredragon@gmail.com>
 * 
 *
 */

#include "system.h"
#include "video.h"
#include "k_defines.h"

void clear_screen() // clear the entire text screen
{
	char *vidmem = (char *) 0xb8000;
	unsigned int i=0;
	while(i<(80*2*25))
	{
		vidmem[i]=' ';
		i++;
		vidmem[i]=WHITE_TXT;
		i++;
	};
};
void update_cursor(int row, int col)
{
	USHORT	position=(row*80) + col;
	// cursor LOW port to vga INDEX register
	outportb(0x3D4, 0x0F);
	outportb(0x3D5, (UCHAR)(position&0xFF));
	// cursor HIGH port to vga INDEX register
	outportb(0x3D4, 0x0E);
	outportb(0x3D5, (UCHAR)((position>>8)&0xFF));
};
